Internal-combustion-engine cylinder.



Patented Jan 1,1918.

G.- E. BRADSHAW.

INTERNAL CDMBUSHON NGINE CYLINDER APPLICATION FILED MAR. 12. IBM.1,252,319.

alumna n. tanans'naw, or nnnsn'm, waL'roN-oN-rnms, ENGLAND.

. I m'rnnnAL-coxnosrIon-nuamn cYLmnan.

Specification of Letters Patent.

Patented Jan. 1, 1918.

- Application filed lurch 12, 1917. Serial No. 154,388.

To all whom it may concern: 1

Be it known that I, GRANVILLE Easrwoon BRADSHAW, a subjectof the King ofGreat Britain and Ireland;j ;of A. B. 0. Motor Works,Hershanl,WaltonJni-Thames, in the county of Surrey, England, haveinvented new and useful Improvements in Internal- Combu stion-EngineCylinders, of which the following is a specification.

y invention relates to the design or.

manufacture of internal. combustion engine cylinders for use on petrol,oil, and gas engines, of all types, but partipularly for aeronauticalengines, motor car and motor cycle engines, light stationary engines,and the like, where it is desirable to cool the cylinders Without thenecessity of using water circulation.

Made according to my present invention, the cylinders are very light,cheap to manu-- facture, and they secure the advantages obtained by" theuse of materials of high heat conductivity...

Formerly, cylinders have been made of cast iron, and other materialswith fins or gills madeof sheet or cast copper, aluminium, and the like,fitted by suitable means to the outside, but such arrangements have thedisadvantage of insufiicient. metallic contact bawe the cylinder wallsand the gills,

or-the necessity of brazing or otherwise attaching these satisfactorily.

The best known form of air cooled cylinder is that in which the cylinderis made of cast iron, with the cooling fins or gills cast around theoutside, but thishas the disad vantage that cast iron is a verypoor-conductor of heat, and a sufficient number of fins or lgllls togive the maximum amount of coo 1 ng cannot be cast on the cylinder onaccount of the difiiculties encountered in the manufacture of thecasting and the necessity for comparatively thick fins or ,gills, inorder to render casting easy.

.In the drawing, I

igure 1 is a central vertical section through an engine cylinder havingmy inag. 21s a sectional view taken at 'zright angles to Fig. 1 takenbetween two adjacent ribs or'fins.

.In my invention I employ a cylinder A machinedfrom a steel bar or tube,or other material of high heat conductivity, on the outside of which aremachined fins or gills v deposited, and a C of the correct size, shapeand s 0 acing to give the most ,efiectlve cooling.

op eris then electrically deposited on the outslde of the cylinder toform a layer B over both the cylinder and fins sides of the fins.

materials for conducting heat, but any other metal that is asatisfactory heat conductor may be used where it is possible to depositsame. Any such deposit may be applied either to individual cylinders orto cylinders assembled in a group.

- The advantages obtained by my invention are that the cylinders are 0cap to manufacture, most scientifically correct spacing and shape offins, etc, can be obtained, there is an excellent support for the copperwhen maximum amount .of heat can be dissipated by the fins owin to theconduction of heat by the layer B f cylinder body to the tips of thefins.

I claim:

1. As an'article of manufacture an engine cylinder having radiating finsintegral therewith, said cylinder and fins having a strength, rigidity,and heat conductivity of the order of steel, and a continuous exposedlayer of copper of substantially unlform thickness adhering to the sidesof said -fins and the outer surface of said cylinder.

2. An engine cylinder provided with in tegral radiating fins. and anadherent coat ing of metal of high heat conductivity of substantiallyuniform thickness on the cylinder and fins whereby heat from thecylinder barrel is conducted toward the tips of the fins bysaid metal ofhigh thereby providing a cylinder of greater radiation capacity thanthat obtained by one having fins made of the same material as thecylinder. and of greater strength than one having fins of high heatconducting metal only.

3. An engine cylinder having integral fins tially uniform thickness ofmetalof high heat conductivity as compared with the heat conductivityoftlie body of the cyl nder 1n adhesive contact in said cylinder andfins over substantially the entire surface them.

in order to assist in con-' ducting the heat from the cylinder along therom the I heat conductivity,

lot

of whereby greater radiation capacity of he cylinder is obtained andalso strength of the cylinder as compared with cylinders havinseparately attached fins.

4. 11 engine cylinder with integral fins, said cylinder and fins beingof homogeneous steel to provide high strength and heat conductivity, anda la er of copper of substantially uniform thic ness in adhesive contactwith said cylinder and fins over substantiall the entire surfacethereof, whereby hig heat conductivity of the fins is obtained and alsowhereby greater strength for the bined cylinder and fins is obtainedthan would be obtained with separate fins.

5. An engme cylinder having'integral fins homogeneous therewith, saidcylin er and fins being of a material of high strength and heatoonductivitfv asoompared with cast iron, and a layer 0 metal ofsubstantially uniform thickness and of hi%)h heat conductivityas'compa-red with the ody of the cylinder in adhesive contact with saidcylinder and fins over substantially the entire surface thereof.

GRANVILLE E. BRADSHAW.

